void main(List<String> args) {
  Map goods_map = {};

  goods_map['goods_id'] = 0;
  goods_map['goods_name'] = '连衣裙';
  goods_map['goods_count'] = 20;
  goods_map['goods_price'] = 1000;

  print(goods_map);

  goods_map.remove("goods_price");
  print(goods_map);

//循环
  goods_map.forEach((key, value) {
    print('当前key:$key,当前value:$value');
  });
}
